<h1>显式指定通过for(for的值就是对应radio的id的值)</h1>

<form>

<label for="male">Male</label>

<input type="radio" name="sex" id="male" />

<br />

<label for="female">Female</label>

<input type="radio" name="sex" id="female" />

</form>

<h1>隐式指定只用label标签把radio包括进来</h1>

<form>

<label>Male<input type="radio" name="sex" id="male" /></label>

<br />

<label>Female<input type="radio" name="sex" id="female" /></label>

</form>